A corrosion-fatigue test was performed on Alclad 2024, 2024 bare, and 6013 bare aluminum alloy sheet materials to compare their respective corrosion-fatigue resistance. In addition, metallographic and scanning electron fractographic examinations of some of the tested specimens were performed to evaluate the mode of cracking and the nature of failure in these materials. It was found that Alclad 2024 had superior resistance to corrosion compared to the 2024 bare and 6013 bare specimens, with the 2024 bare performing slightly better than the 6013. Fractographic and microstructural examinations showed that the clad layer of Alclad 2024 provided protection to its base metal from corrosion, resulting in longer corrosion-fatigue life. The lower corrosion-fatigue life of the 6013 bare material was due to intergranular corrosion.
